KR101914509B1 - Apparatus and Method for Finding out Birthplace of Passive Intermodulation(PIM) - Google Patents

Abstract

The present invention provides a time delay module at a reference signal output terminal (or a PIM signal output terminal) for detecting a PIM occurrence position, thereby dramatically improving the PIM generation position detection accuracy to a level of 10 cm and maintaining the PIM induced components more quickly and accurately The present invention relates to a position detection apparatus and method for generating a PIM.

Description

FIELD OF THE INVENTION [0001] The present invention relates to an apparatus and method for detecting a location where a passive intermodulation occurs,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for generating a passive intermodulation (PIM), and more particularly, to an apparatus and method for detecting a PIM generation position more quickly and accurately.

Recently, with the increasing demand for mobile networks and wireless data services, domestic and overseas mobile communication service providers have been trying to build an efficient wireless network capable of securing more frequency bands and enabling multi-band services. Due to problems such as high installation cost and maintenance cost, it is not practical to install and operate each of the feeder lines in an in-building. Recently, there have been an increasing number of cases in which a service using a building supply line is commonly used.

However, when a multi-band service is provided using the same feeder line in a building, PIM (passive intermodulation) occurs, causing interference between the uplink channel and the downlink channel signal, There is a fear of a sharp decrease. Since PIM is mainly caused by contact failure due to aging of passive components such as cable connectors, multiplexers, circulators, etc., the root cause of PIM problems must be precisely identified and replaced or repaired. . Because in-building power lines are buried in ceilings or walls in buildings, it is necessary to be able to accurately estimate the point where the PIM is generated so that the parts can be replaced or repaired in a short period of time.

To this end, a conventional PIM generation position detecting apparatus is provided with a time delay between a reference signal generated by using a Frequency Modulation Continuous Wave (FMCW) signal and a CW (Continuous Wave) signal, and a PIM signal input to an in- And estimates the approximate PIM generation position by judging the bit frequency difference by the digital signal processing. However, since existing PIM generation position detection devices have accuracy of several m or less, there are a plurality of PIM generation position candidate points, and there is a disadvantage in that replacement and repair time of PIM inducing parts are considerably prolonged.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above problems, and it is an object of the present invention to provide a time delay module for a PIM generation position detection (or a PIM signal output end) The present invention provides a PIM generation location detecting apparatus and method that can dramatically improve the accuracy to the level of 10 cm and maintain the PIM induced parts more quickly and accurately.

The technical problems of the present invention are not limited to the above-mentioned technical problems, and other technical problems which are not mentioned can be understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided an apparatus for detecting a position of a PIM according to an embodiment of the present invention. The apparatus includes a frequency modulation continuous wave (FMCW) A time delay module for delaying either a reference signal based on a Continuous Wave signal or a PIM (Passive Intermodulation) signal from an in-building feeder line; A time delay control module for generating a control value for the amount of time delay according to a control command; And a control unit for generating the control command by performing a FFT on the bit frequency signal based on another signal among the reference signal and the PIM signal delayed by the time delay module and between the reference signal and the PIM signal, (Fast Fourier Transform) signal processing, and a control unit for calculating a PIM generation position based on the control value for the amount of time delay.

Wherein the control unit changes the PIM signal level information for the distance to the PIM generation position according to the FFT signal processing result for the bit frequency signal and changes the PIM signal level information from the PIM generation position to the PIM A frequency difference of the bit frequency having a predetermined power value or more on the basis of the power value of the FFT processing result is checked in order to use the principle that the distance to the generation position varies, And calculates the PIM generation position.

The frequency of the reference signal is 2 * f ₁ -f ₂ , where f ₁ is the frequency of the FMCW signal and f ₂ is the frequency of the CW signal. The bit frequency signals are I (in-phase) and Q (quadrature-phase) signals.

The PIM generation position detection apparatus includes an I / Q demodulator for generating the I and Q signals, a Low Pass Filter (LPF), a signal level controller, an Analog-to- Digital converter, and a signal processor for processing the FFT signal.

Wherein the controller calculates a power value of each of the unit frequency bands with respect to the result of the FFT signal processing and sequentially checks the entire frequency band to determine, in a corresponding unit frequency band (k) having a power value equal to or greater than a first threshold value, Wherein the time delay module controls the time delay module to generate the time delayed signal by a predetermined unit (DELTA) by the control command to calculate the PIM generation position based on the k value and the i value when the following equation is satisfied,

Here, P _{B (k-Δ * i)} is the power value in i when sequentially scanned by Δ with respect to (i = 1, 2, .., M-1) in k, Th2 is the second threshold , P _{B (j)} are respective power values for the total frequency band divided by K (j = 1, 2, 3,, K), and M and K are natural numbers.

The control unit finds the k value and the i value, and sequentially checks the mathematical expression for the remaining unit frequency bands of the entire frequency band, updates the k value and the i value, and calculates the PIM generation position .

According to another aspect of the present invention, there is provided a method for detecting a PIM occurrence position in a PIM generation position detecting apparatus, the method comprising: generating a control value for a time delay amount according to a control command; Delaying any one of a reference signal based on a Frequency Modulation Continuous Wave (FMCW) signal and a continuous wave (CW) signal or a passive intermodulation (PIM) signal coming from an in-building power supply line according to a control value for the amount of time delay; ; And a FFT (Fast Fourier Transform) signal processing for a bit-frequency signal based on a signal delayed according to the control value among the reference signal and the PIM signal and another signal for which the time delay is not performed among the reference signal and the PIM signal And calculating a PIM generation position based on the result of the calculation and the control value for the amount of time delay.

Wherein the step of calculating the PIM generation position changes the PIM signal level information for each distance to the PIM generation position according to the FFT signal processing result with respect to the bit frequency signal, In order to utilize the principle that the distance to the PIM generation position varies depending on the amount of delay, a bit frequency difference occurrence according to the FFT signal processing result is checked, and a power difference of at least a predetermined power value It is possible to calculate the PIM generation position by calculating the detailed scanning power value in the frequency band of the bit frequency.

The frequency of the reference signal is 2 * f ₁ -f ₂ , where f ₁ is the frequency of the FMCW signal and f ₂ is the frequency of the CW signal. The bit frequency signals are I (in-phase) and Q (quadrature-phase) signals.

The step of calculating the PIM generation position includes an I / Q demodulator that generates the I and Q signals, a low pass filter (LPF), a signal level adjuster, an Analog- to-digital converter, and outputting the FFT processing result using a signal processor for processing the FFT signal.

Calculating a power value of each of the unit frequency bands with respect to the FFT signal processing result in the step of calculating the PIM generation position and sequentially checking the power frequency values of the unit frequency bands and sequentially calculating a corresponding unit frequency having a power value equal to or higher than a first threshold value In the band (k), the control command is generated so as to generate the time-delayed signal by a predetermined unit (?), And the PIM generation position is calculated based on the k value and the i value when the following equation is satisfied ,

Here, P _{B (k-Δ * i)} is the power value in i when sequentially scanned by Δ with respect to (i = 1, 2, .., M-1) in k, Th2 is the second threshold , P _{B (j)} are respective power values for the total frequency band divided by K (j = 1, 2, 3,, K), and M and K are natural numbers.

The k value and the i value are found, and the k value and the i value are updated by checking whether or not the above equation is satisfied for the remaining unit frequency bands of the entire frequency band sequentially, thereby calculating the PIM generation position.

According to the PIM generation position detecting apparatus and method according to the present invention, a time delay module is introduced into a reference signal output terminal (or a PIM signal output terminal) for PIM generation position detection to adjust a reference signal, The accuracy of the detection can be improved to the level of 10 cm. In this way, the accuracy of PIM occurrence location detection is drastically improved, and the maintenance cost of the in-building power supply network is greatly reduced by shortening the replacement and repair time of the PIM problem parts in the in-building power supply line. In addition, as the PIM problem is solved in a short time, it is expected that the mobile service radius is enlarged and the performance of the dialing efficiency is improved.

1 is a block diagram of an apparatus for detecting a PIM generation position according to an embodiment of the present invention.
2 is an exemplary diagram of a reference signal according to an embodiment of the present invention.
3 is an exemplary diagram of a PIM signal generated on a feed line according to an embodiment of the present invention.
4 is a conceptual diagram of a time delay between a reference signal and a PIM signal generated on a feed line according to an embodiment of the present invention.
FIG. 5 is a diagram illustrating a correlation between a time delay between a reference signal and a PIM signal generated from a feeder line, and a bit frequency of a bit frequency signal according to an embodiment of the present invention.
FIG. 6 is a diagram illustrating an example of distance conversion between a PIM generation position estimation device and a PIM generation point estimated based on a bit frequency of a bit frequency signal according to an embodiment of the present invention.
FIG. 7 is an exemplary diagram illustrating a difference in bit frequency according to a time delay between the reference signal of FIG. 2 and the PIM signal generated by the feeder line of FIG. 3;
8 is a diagram illustrating a waveform of a reference signal delayed by 5 ns using a time delay module according to an embodiment of the present invention.
FIG. 9 is a diagram illustrating a difference in bit frequency according to a time delay between a 5 ns delay signal of the reference signal of FIG. 8 and a PIM signal generated by the feeder of FIG. 3;
10 is a flowchart illustrating an operation of the PIM generation position detecting apparatus according to an embodiment of the present invention.
11 is a diagram illustrating an example of a unit frequency band according to an embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the difference that the embodiments of the present invention are not conclusive.

In describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. Also, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are to be interpreted in an ideal or overly formal sense unless explicitly defined in the present application Do not.

FIG. 1 is a block diagram of an apparatus 200 for detecting a PIM generation position according to an embodiment of the present invention.

Referring to Figure 1, PIM generation position detection device 200 according to one embodiment of the invention, the control unit (190), FMCW (Frequency Modulation Continuous Wave) (f ₁₎ signal generator 100, a signal level adjuster ( 102), HPA (High Power Amplifier) (106), a frequency doubler (153), CW (Continuous Wave) (f ₂₎ signal generator 110, a signal level adjuster 112, a divider (114), HPA (116) A mixer 151, a multiplexer 130, an in-building feeder line 140, a radio frequency (RF) switch 118, a band pass filter (BPF) 120, a time delay module 160 A time delay control module 165, an LNA (Low Noise Amplifier) 171, a signal level controller 173, a BPF 175, an I / Q demodulator 180, a low pass filter Pass filter 182, a signal level adjuster 184, an analog-to-digital (A / D) converter 186 and a signal processor 188.

The control unit 190 may be a semiconductor processor such as a microcontroller unit and is responsible for overall control of each component of the PIM generation position detecting apparatus 200. [ The control unit 190 may be implemented to include the functions of one or more other components of the PIM generating position detecting device 200. [

The FMCW (f ₁ ) signal generator 100 generates an FMCW signal using a DDS (Direct Digital Synthesizer) or the like and generates a frequency f ₁ signal, that is, an FMCW (f ₁ ) signal 101 through a frequency multiplier.

The FMCW (f ₁₎ signal 101 is a signal level is amplified or attenuated by the signal level adjuster 102, a signal level adjuster 102, the output signal 103 is the distributor 104 generated by the FMCW signal generator (100) The signals 105 and 152 distributed from the distributor 104 are transmitted to the HPA 106 and the multiplier 153, respectively.

CW (f ₂₎ signal generator 110 is frequency-frequency synthesizer (Synthesizer) using the OCXO (oven controlled crystal oscillator), etc. (Phase Lock Loop), the reference clock to the PLL oscillator f ₂ signal, i.e., CW (f ₂ ) ≪ / RTI >

CW (f ₂₎ signal generator the CW (f ₂₎ signal 111 generated by the unit 110 and the signal level is amplified or attenuated by the signal level adjuster 112, a signal level adjuster 112, an output signal 113 The signals 115 and 151 distributed by the distributor 114 and distributed by the distributor 114 are transferred to the HPA 116 and the mixer 151, respectively.

The first signal 107 amplified by the HPA 116 and outputting the frequency f ₁ is output to the in-building feeder line 140 through the predetermined input terminal 131 via the multiplexer 130.

The RF switch 118 can selectively use one or two output ports. The RF switch 118 outputs the second signal 117, which is the frequency f ₂ amplified and output from the HPA 106, to the multiplexer 130 And the multiplexer 130 inputs the second signal 117 to the in-building power supply line 140 through the predetermined input terminal 131. The in- The RF switch 118 transmits the second signal 117 to the BPF 120 under the control of the control unit 190 and the BPF 120 transmits the second signal 117 to the corresponding processed And outputs the signal to the feeder line 140 via the predetermined input terminal 121.

To predict and detect PIM signals by distance, a PIM detection reference signal with a frequency (2 * f ₁ -f ₂ ) is needed. To this end, the mixer 150 and the BPF 156 receive the signal 154 output by frequency multiplication (2 * f ₁ ) and the output signal 151 of the frequency divider 114 of frequency f ₂ from multiplier 153, And the signal level adjuster 158 (amplification or attenuation of the signal level), respectively, a basic reference signal 159 is generated for detecting the PIM generation position. The frequency of the generated reference signal 159 is 2 * f ₁ -f ₂ . For example, if the operating frequency band of the first signal based on the FMCW (f ₁ ) signal generator 100 is 2145 MHz to 2170 MHz and the frequency of the second signal based on the CW (f ₂ ) signal generator 110 is 2.34 GHz, the reference signal 159 becomes an FMCW signal operating in the 1950 MHz to 2000 MHz frequency band. To facilitate understanding of the description, the FMCW signal is assumed to be a signal operating in the 1950 MHz to 2000 MHz frequency band, if necessary, and will be described in detail below.

In the present invention, the time delay module 160 and the time delay control module 165 are additionally provided at the output of the reference signal 159 to adjust the time delay of the reference signal 159 in units of 1 nsec, And the position detection accuracy can be dramatically improved to the level of 10 cm.

The PIM signal 133 that returns through the down channel of the in-building feed line 140 after the signals 107 and 117 are input to the in-building feed line 140 via the predetermined input terminal 131 is input to the multiplexer 130 To the LNA 171 in the receive path. Subsequently, only the PIM signal 176 of the 1950 MHz to 2000 MHz frequency band (2 * f ₁ -f ₂ ) remains after passing through the signal level adjuster 173 (amplification or attenuation of the signal level) and the BPF 175. For reference, the time delay module 160 proposed in the present invention may be installed after the BPF 175 located in the PIM signal path, that is, between the I / Q demodulator 180 and the BPF 175, if necessary.

The reference signal 159 for detecting the PIM generation position generated as described above is supplied to the delayed signal 161 in the time delay module 160 according to the control value 166 for the amount of time delay of the time delay control module 165, And a PIM signal 176 are input to an I / Q demodulator 180. The I / Q demodulator 180 demodulates a corresponding beat frequency beat including a corresponding I (in-phase) and Q (quadrature- frequency < / RTI >

Subsequently, the bit frequency signal 181 passes through the LPF 182 and the signal level adjuster 184 (amplification or attenuation of the signal level) in sequence, and then through the A / D converter 186 to the signal processor 188 . Since the bit frequency signal 187 passed through the A / D converter 186 has distance information on the PIM generation signal and PIM signal size information, it is possible to obtain the FFT (Fast Fourier Transform) signal processing result in the signal processor 188 And converted into PIM signal level information by distance to the PIM occurrence position with respect to the beat frequency (see FIG. 6).

Using the results of the FFT signal processing 189 and the control value 167 of the time delay control module 165, the control unit 190 finally determines the PIM generation position (the cable connector, the multiplexer, the circulator The position of the back part, etc.).

2 is an exemplary diagram of a reference signal 159 in accordance with an embodiment of the present invention.

(2 * f ₁ ) signal 154 generated at the FMCW (f ₁ ) signal generator 100 and output to the multiplier 153 from the signal 152 distributed from the first distributor 104, f ₂₎ a signal generator 110, signal 151 of frequency f ₁ output from the generation in the second divider 114, a mixer (mixer) (150) and a BPF (156) and a signal level adjuster 158, respectively, Once passed, a basic reference signal 159 for detecting the PIM generation position is generated as shown in FIG.

For example, the reference signal 159 is f _{R _start} ~ f _R for operation from _{_end} Hz frequency band, the operation frequency of the reference signal 159, starting from f _{R _start} over a predetermined unit time width (for example, 20ns) Each time the frequency increases by a predetermined increase (for example, 100 Hz). For example, if the operating frequency band of the first signal 152 is 2145 MHz to 2170 MHz and the frequency of the second signal 151 is 2.34 GHz, then the reference signal 159 will be at a frequency of 1950 MHz to 2000 MHz And becomes an FMCW signal operating in the band.

3 is an exemplary diagram of a PIM signal 176 generated on a feed line in accordance with an embodiment of the present invention.

For example, the PIM signal generated from the in-building power line 140 as a signal delayed by 425 ns with respect to the reference signal 159 is transmitted through the downlink channel 133 and is transmitted through the multiplexer 130 to the LNA 171, The signal level adjuster 173, and the BPF 175, and the PIM signal 176 observed is shown in FIG.

4 is a time delay conceptual diagram between a reference signal 159 according to an embodiment of the present invention and a PIM signal 176 generated on a feeder line. As shown in FIG. 4, when there is a time delay between the reference signal 159 and the PIM signal 176, a frequency difference between the reference signal 159 and the PIM signal 176 is shown. 5 is an illustration of the correlation between the time delay between the reference signal 159 and the PIM signal 176 generated on the feed line and the bit frequency of the bit frequency signal 187 according to an embodiment of the present invention.

6 is a diagram illustrating a distance-based conversion between a PIM generation position detection device and a PIM generation point estimated based on a bit frequency of a bit frequency signal 187 according to an embodiment of the present invention. 6 shows an example assuming that the permittivity of the in-building feeder line 140 is 1.5. Since the PIM generation distance with respect to the bit frequency can be converted differently according to the permittivity of the feeder line 140, The dielectric constant of the feeder line 140 installed in the building must be accurately measured and reflected. As described above, the PIM signal level varies depending on the distance to the PIM generation position in accordance with the FFT result for the bit frequency signal, and the distance to the PIM generation position varies depending on the amount of time delay of the PIM signal 176 from the PIM generation position , It is possible to estimate the PIM generation position.

FIG. 7 illustrates an example of a bit frequency difference according to a time delay between the reference signal 159 of FIG. 2 and the PIM signal 176 generated from the feed line of FIG.

7 shows that the reference signal 159 and the PIM signal 176 are input to the I / Q demodulator 180 to generate the bit frequency signal 181 and then the LPF 182 and the signal level adjuster 184 It corresponds to analog signal output after passing sequentially. As shown in FIG. 7, since the time delay (for example, 25 ns) between the reference signal 159 and the PIM signal 176 is not an integer multiple of 20 ns, it can be seen that the output bit frequency difference is not constant. That is, the signal due to the difference of the bit frequency of 2100 Hz is repeatedly output at 2200 Hz for the period of 5 ns and for the period of 15 ns. When the signal produced by the bit frequency difference passes through the A / D converter 186 and processed in the FFT (Fast Fourier Transform) signal processing in the signal processor 188, the permittivity of the building feed line having a bit frequency error of 100 Hz And 2m when converted to a distance), there is a disadvantage that the estimated position error of PIM is large.

In order to compensate for this, in the present invention, the time delay module 160 is installed in the output terminal of the reference signal 159 (or the output terminal of the PIM signal 176), and the time delay control module 165 is additionally provided, So that the time delay of the signal 159 (or the PIM signal) can be adjusted.

8 is an exemplary diagram of a waveform in which the reference signal 159 according to an embodiment of the present invention is delayed by 5 ns using the time delay module 160. FIG. 9 is an exemplary diagram illustrating a difference in bit frequency according to a time delay between a 5 ns delay signal of the reference signal 159 of FIG. 8 and a PIM signal 176 of the feed line of FIG.

As shown in FIG. 8, since the difference in time delay between the reference signal 159 and the PIM signal 176 delayed by 5 ns is an integer multiple of 20 ns (for example, 20 ns), the difference in bit frequency is constant at 2100 Hz. Also, when the FFT processing is performed on the output signal of the A / D converter 186 corresponding to the bit frequency difference while the reference signal is shifted by 1 ns using the time delay module 160, the PIM generation position detection accuracy is remarkably reduced to 10 cm And the like. As described above, the time delay module 160 may be provided after the BPF 175 located in the PIM signal path, that is, between the I / Q demodulator 180 and the BPF 175, if necessary. Under the control of the controller 190, the time delay control module 165 may generate a control value for time delaying the reference signal 159 or the PIM signal 176.

Hereinafter, the PIM generation position detection operation of the PIM generation position detection apparatus 200 according to an embodiment of the present invention will be described in more detail with reference to the flowchart of FIG.

10 is a flowchart illustrating an operation of the PIM generation position detecting apparatus 200 according to an embodiment of the present invention.

First, the signal processor 188 of the PIM generation position detecting apparatus 200 processes the output value of the A / D converter 186 as an FFT signal (1010). At this time, the controller 190 calculates power values for each of the unit frequency bands of K (1, 2, 3, K) (K is a natural number) ). 9, the unit frequency corresponds to 100 Hz, K = 50, and the time delay per unit frequency corresponds to 20 ns. The unit frequency band is explained with reference to FIG. 11, for example, and the power value P _{B (k)} for each unit frequency band is given by Equation (1).

[Equation 1]

Next, the control unit 190 checks whether or not P _{B (k)} is equal to or greater than the first threshold value Th1 (1040) in order for the entire frequency band, that is, k = 1 to If after a further increase in the k value _{(1035), P B (k} ) is the first threshold value, repeating the process of checking whether (Th1) or more, and the first threshold value P _{B (k)} (Th1) The process proceeds to the next step (1045).

The control unit 190 may generate a control command to generate a control value 166 for the amount of time delay through the time delay control module 167 so that the time delay module 165 may delay (1 / n) (M is a natural number) reference signal 159 (or PIM (1 / N)) with respect to (i = 1, 2, ..., M- The control unit 190 scans the FFT result of the signal processor 188 to delay each of the power values P _{B (k -Δ * i)} , (i = 1, 2, .., M-1), and temporarily stores the resultant value in a storage means such as a memory. Next, the control unit 190 checks whether the following condition (2) is satisfied based on the second threshold value Th2 (1050).

&Quot; (2) "

If the above condition (1050) is satisfied, the control unit 190 stores the corresponding k value and the i value in a storage means such as a memory (1055). Otherwise, the control unit 190 skips directly to the next step (1060) without storing it.

The controller 190 checks whether k = K (1060). If not, the controller 190 increments (1035) the value of k and repeats steps 1040 to 1060. If k = K, the PIM generation position is detected (1070) from the k value and the i value stored in the memory or the like and the PIM generation position detection process is terminated. That is, after finding the k value and the i value, the k value and the i value are updated by checking the satisfaction of the expression (2) sequentially for the remaining unit frequency bands of the entire frequency bands until K, the PIM generation position can be calculated based on the i value. When the k value and the i value are updated, there is a time delay between the reference signal 159 and the PIM signal 176 as shown in FIG.

The control unit 190 uses a predetermined function or a lookup table based on the distance conversion between the PIM generation point and the beat frequency of the bit frequency signal 187 as shown in FIG. 6, The PIM generation distance corresponding to the delay can be calculated and the PIM generation location information can be output. The calculation of the PIM generation position is based on the fact that not only the PIM signal level (the signal level of the FFT result) for the distance to the PIM generation position is changed according to the FFT result for the bit frequency signal but also the PIM signal level of the PIM signal 176 The difference in the distance to the PIM generation position according to the amount of time delay is used. For this use, the occurrence of the bit frequency difference according to the FFT result is checked and the power value of the FFT processing result (The power value at i) in the frequency band k of the bit frequency having the predetermined power value Th1 or more based on the power value Th1 and the detection accuracy of the point where the PIM is generated can be increased .

As described above, the PIM reference signal 159 (or the PIM signal 176) is adjusted by utilizing the time delay module according to the present invention, thereby effectively improving the PIM generation point detection performance in the in-building power supply line 140.

As described above, in the PIM generation position detecting apparatus 200 according to the present invention, the time delay module 160 is introduced into the output terminal (or PIM signal output terminal) of the reference signal 159 for detecting the PIM generation position, The detection accuracy of the point where the PIM is generated in the in-building power supply line 140 can be improved to about 10 cm. In this way, the accuracy of the PIM generation location detection is drastically improved, and the maintenance and repair cost of the in-building power supply network is greatly reduced by shortening the replacement and repair time of the components that cause the PIM signal generated in the in-building power supply line 140 have. In addition, as the PIM problem is solved in a short time, it is expected that the mobile service radius is enlarged and the performance of the dialing efficiency is improved.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention.

Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

The controller 190,
In building power line 140,
Time delay module 160,
Time delay control module 165,
I / Q demodulator 180,
A low pass filter (LPF) 182,
Regulators of signal level (184)
An analog-to-digital (A / D) converter 186,
The signal processor (188)

Claims (14)

A time delay control module for generating a control value for a time delay amount in accordance with a control command;
A time delay module for delaying any one of a reference signal based on a Frequency Modulation Continuous Wave (FMCW) signal and a continuous wave (CW) signal or a passive intermodulation (PIM) signal from an in-building power supply line according to the control value;
An in-phase / quadrature-phase (Q) demodulator for generating a bit frequency based on a first signal delayed by the time delay module and a second signal not time delayed among the reference signal and the PIM signal; ; And
A control unit for generating the control command, calculating a PIM generation position based on a result of Fast Fourier Transform (FFT) signal processing for the bit frequency signal, and a control value for the amount of time delay;
And detecting the position of the PIM. The method according to claim 1,
Wherein,
Wherein the PIM generating position is calculated by calculating a detailed scanning power value in a frequency band of the bit frequency having a predetermined power value or more based on the power value of the FFT processing result. The method according to claim 1,
Frequency 2 * and f ₁ -f _2, where, f ₁ is a PIM generated position detection device characterized in that the frequency of the CW signal and the frequency f ₂ of the FMCW signal of the reference signal. The method according to claim 1,
Wherein the bit frequency signal comprises I (in-phase) and Q (quadrature-phase) signals. 5. The method of claim 4,
Further comprising a low pass filter (LPF), a signal level adjuster, an analog-to-digital (A / D) converter, and a signal processor for processing the FFT signal, which are sequentially coupled to the I / Q demodulator. Location detection device. The method according to claim 1,
Wherein,
Calculating a power value of each of the unit frequency bands with respect to the FFT signal processing result,
The time delay module sequentially generates a signal delayed by a predetermined unit (?) By the control command in a corresponding unit frequency band (k) having a power value equal to or higher than a first threshold value And calculates the PIM generation position based on the k value and the i value when the following expression is satisfied,

Here, P _{B (k-Δ * i)} is the power value in i when sequentially scanned by Δ with respect to (i = 1, 2, .., M-1) in k, Th2 is the second threshold , P _{B (j)} are respective power values for dividing the entire frequency band by K (j = 1,2,3 ,,, K), and M and K are natural numbers. Device. The method according to claim 6,
Wherein,
The k value and the i value are found, and the k value and the i value are updated by checking whether or not the formula is satisfied with respect to the remaining unit frequency bands of the entire frequency band sequentially, thereby calculating the PIM generation position PIM generation location detection device. A method for detecting a PIM generation position in a PIM generation position detection apparatus,
Generating a control value for a time delay amount in accordance with a control command;
Delaying any one of a reference signal based on a Frequency Modulation Continuous Wave (FMCW) signal and a continuous wave (CW) signal or a passive intermodulation (PIM) signal coming from an in-building power supply line according to a control value for the amount of time delay; ;
Generating a bit frequency based on a first signal delayed in time and a second signal delayed in the reference signal and the PIM signal; And
Calculating a PIM generation position based on a result of Fast Fourier Transform (FFT) signal processing of the bit frequency signal and a control value of the amount of time delay;
And detecting the position of the PIM. 9. The method of claim 8,
In the step of calculating the PIM generation position,
Calculating a detailed scanning power value in a frequency band of the bit frequency having a predetermined power value or more based on the power value of the FFT processing result, and calculating the PIM generation position. 9. The method of claim 8,
Frequency 2 * and f ₁ -f _2, where, f ₁ is a PIM generated position detecting method, characterized in that the frequency and f ₂ is the frequency of the CW signal of the FMCW signal of the reference signal. 9. The method of claim 8,
Wherein the bit frequency signal comprises I (in-phase) and Q (quadrature-phase) signals. 12. The method of claim 11,
The step of calculating the PIM generation position includes:
An I / Q demodulator for generating the I and Q signals; an LPF (Low Pass Filter), a signal level controller, an A / D (Analog-to-Digital) converter sequentially connected to the I / Q demodulator, Outputting the FFT processing result using a signal processor for processing
And detecting the position of the PIM. 9. The method of claim 8,
In the step of calculating the PIM generation position,
Calculating a power value of each of the unit frequency bands with respect to the FFT signal processing result,
The controller sequentially controls the entire frequency band so as to generate the time-delayed signal by a predetermined unit (?) In the unit frequency band (k) having the power value equal to or higher than the first threshold value by the control command, Calculates the PIM generation position based on the k value and the i value when the equation is satisfied,

Here, P _{B (k-Δ * i)} is the power value in i when sequentially scanned by Δ with respect to (i = 1, 2, .., M-1) in k, Th2 is the second threshold , P _{B (j)} are respective power values for dividing the entire frequency band by K (j = 1,2,3 ,,, K), and M and K are natural numbers. Way. 14. The method of claim 13,
The k value and the i value are found, and the k value and the i value are updated by checking whether or not the formula is satisfied with respect to the remaining unit frequency bands of the entire frequency band sequentially, thereby calculating the PIM generation position How to detect the location of PIM occurrence.

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